how do they get cranes on top of skyscrapers

Skyscrapers are the most iconic structures of modern cities. With their towering heights and magnificent architecture, they have become symbols of human innovation and achievement. However, have you ever wondered how cranes are placed on top of these skyscrapers, which are sometimes hundreds of meters high? In this article, we will explore the methods used to install cranes on top of skyscrapers.

The Types of Cranes Used

The two most commonly used cranes for erecting a skyscraper are the tower crane and the mobile crane. The tower crane is a fixed crane that is assembled on site, whereas a mobile crane is a self-propelled vehicle that can drive directly to the construction site and lift weights with a telescopic arm. In most cases, tower cranes are used on tall buildings because they can be raised to the desired height using hydraulic or climbing systems.

The Assembly of Tower Cranes

Tower cranes are assembled on the ground and then raised to their full height using hydraulic or climbing systems. The first step in installing a tower crane is to secure a base or foundation that serves as support for the crane. The base is usually made of concrete and is extremely strong, as it has to hold the weight of the entire structure. Once the base is ready, the tower is erected using prefabricated sections, until it reaches its desired height. After the tower is assembled, the jib and counterweight are attached to the top of the tower. The jib is the horizontal beam that extends from the top of the tower and supports the lifting mechanism.

The Climbing System

The climbing system is used to raise the tower crane to its required height. In this process, the crane is attached to the building vertically with strong bolts. The climber is then lifted by hydraulic systems or jacks which are located in the tower base. This sequential method of dismantling and building is repeated until the crane reaches the necessary height for the construction of the building. The climbing system is a time-consuming process, but it is an essential method that ensures the crane can reach the top of the building.

The Dismantling of Tower Cranes

When the construction is completed, the tower crane is dismantled in reverse order, from top to bottom. The jib and counterweight are removed first, followed by the tower. The elements are lowered using the crane’s winch and dismantled using a mobile crane. The sections are transported from the building site and taken to storage for future use. This process is time-consuming but critical to prevent any damage to the newly built structure.

Conclusion

In conclusion, erecting a crane on top of a skyscraper is a challenging and complicated process that requires careful planning and execution. It takes skilled workers, powerful machines, and countless hours of work to complete this feat. By understanding the methods used in this process, we can better appreciate the technology and innovation that goes into building these magnificent structures that shape our modern cityscapes.